树上有一只鸟,there（ ）a bird in the tree
我们的教室里有一位老师和许多学生,（ ）（ ）a teacher and many students in our classroom
树下有两个男孩和一个女孩
（ ）（ ）two boys and a girl under the tree.
what is on the table?桌上有什么?
there（ ）five eggs on the desk.有五个鸡蛋